Mr Smith had a week's vacation, so he said,“I'm going to the seaside by train. ”He put on his best clothes, took a small bag, went to the railway station(车站)and got into the train. He wore a beautiful hat, and he often put his head out of the window during the trip and looked at the beautiful scenery. Suddenly, the wind pulled his hat off.
     Mr Smith quickly threw(扔) his old bag out of the window, too. The other people in the train laughed,“Is your bag going to bring back your beautiful hat?” they asked.
    “No,” Mr Smith answered.”But My name and address are on the bag. If someone finds both of them, he or she will send me the bag and the hat.” 

如图所示，带电体A附近的B点放置一个q₁=+2.0×10^﹣8 C的电荷，若测出它受到的电场力大小为F=8.0×10^﹣6 N，方向如图所示，求：

    I have a good f____. She has a round f____. There are two hands on her face. One is l____. The other is short. Every day she walks and walks. When she walks I can hear nice sound. My friend always tells me to go to school on t____. She always asks me to go to bed e____. Do you know who she is? Yes, you are right. She is a clock.